Caffeine in black tea stimulates the nerve center by stimulating the cerebral cortex, which promotes refreshing and concentration of thinking, thus making the thinking response more acute and enhancing memory; It also has an exciting effect on the vascular system and the heart, strengthens the heartbeat, thus speeding up blood circulation to facilitate metabolism, and at the same time promoting sweating and diuresis, thus accelerating the excretion of lactic acid (a substance that makes muscles feel tired) and other old and waste substances in the body in a two-pronged manner, and achieving the effect of eliminating fatigue.

Promoting fluid production and clearing away heat

Drinking black tea in summer can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react chemically with saliva and stimulate saliva secretion, which makes the mouth feel moist and cool. At the same time, caffeine controls the temperature center of the hypothalamus and regulates the body temperature. It also stimulates the kidney to promote the excretion of heat and dirt and maintain the physiological balance in the body. In addition, black tea is an excellent sports drink. In addition to relieving summer heat, quenching thirst and replenishing water, if you drink it before carrying out sports that require physical strength and endurance (such as marathon running), because caffeine in tea has a refreshing effect, it can also promote the body to burn fat to supply heat energy while retaining liver vinegar during exercise, so people have more endurance.

be diuretic

Under the combined action of caffeine and aromatic substances in black tea, the blood flow of kidney is increased, the glomerular filtration rate is improved, the renal microvessels are expanded, and the renal tubules are inhibited from reabsorption of water, thus contributing to the increase of urine output. This is conducive to eliminating lactic acid, uric acid (related to gout), excessive salt (related to hypertension), harmful substances, etc. in the body, and alleviating edema caused by heart disease or nephritis.

Anti-inflammatory sterilization

Polyphenols in black tea have anti-inflammatory effect, and experiments show that catechins can combine with single-celled bacteria to coagulate and precipitate protein, thereby inhibiting and eliminating pathogenic bacteria. Therefore, it is quite beneficial for patients with bacillary dysentery and food poisoning to drink black tea, and people often use strong tea to coat wounds, bedsores and Hong Kong feet.

detoxify

According to experiments, the tea polyphenols in black tea can adsorb heavy metals and alkaloids, and precipitate and decompose them, which is a boon for modern people whose drinking water and food are polluted by industry. In addition, black tea also has the effects of preventing caries, invigorating stomach and intestine, helping digestion, delaying aging, lowering blood sugar, lowering blood pressure, lowering blood fat, resisting cancer and radiation.

nourishing the stomach

When people drink green tea without eating, they will feel uncomfortable in the stomach. This is because tea polyphenols, an important substance contained in tea, have astringency and have a certain stimulating effect on the stomach, which is more irritating on an empty stomach. Black tea, on the other hand, is made by fermentation and baking. Tea polyphenols undergo enzymatic oxidation under the action of oxidase, and the content decreases, which reduces the irritation to the stomach. In addition, the oxidation products of these tea polyphenols can also promote human digestion, so black tea will not only hurt the stomach, but also nourish it. Drinking black tea with sugar and milk often can diminish inflammation and protect gastric mucosa, and also has certain effect on treating ulcers.

Lu Yu's Zijuan black tea is a new variety of black tea. Violet black tea is rich in natural components such as anthocyanins, theaflavins, thearubigins, etc., among which the content of anthocyanins can be as high as 10~ 15 times that of blueberries, so it shows its remarkable antihypertensive and health-care effects. Lu Yu's purple black tea not only has a breakthrough in blood pressure and health care, but also has a good effect in warming the heart and nourishing the stomach.